Fracture of convoluted and lamellar α2 + γ TiAl alloys

被引：9
|
作者：
Barbi, Nicolas [1 ]
Diologent, Frederic [1 ]
Goodall, Russell [1 ]
Mortensen, Andreas [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, Lab Met Mecan, Stn 12, CH-1015 Lausanne, Switzerland
来源：
INTERMETALLICS | 2012年 / 22卷
基金：
英国工程与自然科学研究理事会;
关键词：
Titanium aluminides; based on TiAl; Fracture toughness; Microstructure; Aero-engine components; TITANIUM ALUMINIDE ALLOYS; TIAL-ALLOY; MICROCRACK NUCLEATION; CRACK-PROPAGATION; DISLOCATION DYNAMICS; GRAIN-REFINEMENT; PST CRYSTALS; RESISTANCE; MICROSTRUCTURE; TOUGHNESS;
D O I：
10.1016/j.intermet.2011.11.001
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Fracture toughness tests are conducted at room temperature and 923 K (650 degrees C) on SENB (Single Edge Notched Bend) specimens of three different (alpha(2) + gamma ) TiAl-based alloys. One alloy is a conventional near fully lamellar Ti-45Al-2Mn-2Nb + 0.8%vol TiB2 XD alloy. The second and third have a composition of Ti -46Al-8Ta, with a novel "convoluted" cast microstructure developed for turbine applications and a coarse near fully lamellar microstructure, respectively. The novel alloy displays fracture toughness values of 13 +/- 2 MPa root m at room temperature and 19 MPa root m at 923 K (650 degrees C); these values approach data for lamellar microstructures, known to be optimal for this class of alloy. In particular, shear ligament toughening is observed with a role of retained lamellar colonies in toughening the convoluted microstructure. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：176 / 188
页数：13
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